I never had an super high blood pressure, even at my heaviest 450+lbs I was at about 130-140 maybe maximum 150 on a bad day but now although I am still quite fat (320lbs) my blood pressure is barely above 100...
Last three days it goes from 96-98 the high one and about 55 the low one.
Of course I am dizzy during the day, I try to drink water as much as possible but I do usually the 2l minimum I cannot say my diet is salt free and it’s getting me a bit worried saying if it is already that low how will it be when I get to 250lbs for example?
I will see my endocrinologist next week and I have an appointment with my surgeon at the end of the month, but until then I seek your wisdom :)

Mine hasn't been that low, which sounds too low, but mine definitely got lower as I started losing weight and I had to quit taking my blood pressure medicine and my surgeon also said to add some salt into my diet.

Mine has been running low also. I'm 2 1/2 post. I've stopped taking my blood pressure meds for now. I'm keeping records of it until I go to my regular doctor in a few weeks. I go to my surgeon this coming week. I go back to work then too so it may change.

Let us know how things go for you @RoRoKitty, hope Doctor says everything is fine.